Stable concentrated solutions of direct dyes and process for their manufacture

ABSTRACT

A process for the production of stable concentrated solutions of water-soluble tertiary ammonium salts of direct dyes, substantially free of inorganic salts is described by condensing in aqueous medium two mols of tertiary ammonium salts of identical or dissimilar azo and/or coloured anthraquinone sulphonic acid and/or carboxylic acid compounds, each of said compounds containing at least one primary or secondary amino group with one mol of a polyfunctional acylating agent in the presence of at least two mols of a tertiary amine with or without the addition of further auxiliary products. The thus obtained concentrated solutions are stable and are useful for the dyeing of cellulosic material, especially paper.

tate at Boliiger et al.

[ Dec. 3, 1974 [75] Inventors: Hans Rudolf BolIigen Mere; Herbert Alexander Potts, Bramhall, both of England [73] Assignee: Ciba-Geigy AG, Basel, Switzerland [22] Filed: Oct. 20, 1971 21 Appl. NO.Z 191,065

[30] Foreign Application Priority Data Oct. 22, I970 Switzerland 1. 15607/70 52 US. (:1. 8/41 R, 8/7, 8/25, 8/26,'8/39, 8/85, 8/86, 8/88, 260/175, 260/377 51 11m.c1 ..D06p 1/06 58 Field 61 Search 8/39 R, 41 R, 85, 86, 88, 8/7, 25, 26, 82, 92, DIG. 7; 260/175, 377

- [56] References Cited 7 UNITED sTATEs PATENTS 3,206,328 9/1965 Shaw et al. ll 7/l38.8 3,480,378 ll/1969 Taube et al 8/39 FOREIGN PATENTS OR APPLICATIONS 1,572,030 6/1969 France OTHER PUBLICATIONS Diserens, The Chemical Technology of Dyeing and Printing, Vol. II, 1951, p. 338.

Primary ExaminerLeon D. Rosdol Assistant Examiner-Bruce I-I. Hess Attorney, Agent, or Firm-Wendeioth, Lind & Ponack 5 7] ABSTRACT A process for the production of stable concentrated solutions of water-soluble tertiary ammonium salts of direct dyes, substantially free of inorganic salts is described by condensing in aqueous medium two mols of tertiary ammonium salts of identical or dissimilar azo and/or coloured anthraquinone sulphonic acid and/or carboxylic acid compounds, each of said compounds containing at least one primary or secondary amino group with one mol of a polyfunctional acylating agent in the presence of at least two mols of a tertiary amine with or without the addition of further auxiliary products. The thus obtained concentrated solutions are stableand are useful for the dyeing of cellulosic material, especially paper.

21 Claims, No Drawings STABLE CONCENTRATED SOLUTIONS OF DIRECT DYES AND PROCESS FOR THEIR MANUFACTURE The invention concerns stable highly concentrated solutions as dyestuff preparations, processes for their production, as well as for industrial purposes their use in making dye liquors which are useful for dyeing textile fibres'and especially paper material.

lt is known to manufacture highly concentrated liquid commercial forms of dyestuffs by dissolving the dyestuff powders or pastes, in suitable aqueous, organic or organic-aqueous media, whereby highly concentrated liquid dyestuff preparations are produced, which, as regards handling and use, offer advantages in several respects over the dry dyestuff preparations. The manufacture of such concentrated liquid preparations is, however, frequently associated with difficulties, since the dyestuffs used as starting products have in most cases been obtained by salting-out and therefore contain a considerable proportion of salts (eletrolytes), which at times are disadvantageous when manufacturing the liquid preparations,and the presence of which can have an adverse influence on the stability of such solutions.

A new process for the manufacture of stable, highly concentrated solutions of dyestuffs, especially direct dyes, substantially free of inorganic salts is now found, which is characterised by condensing in aqueous medium two mols of tertiary ammonium salts of identical or dissimilar azo and/or coloured anthraquinone sulphonic acid and/or carboxylic acid compounds, each of said compounds containing at least one primary or secondary amino group, with one mol of a poly-functional acylating agent in the presence of at least two mols of a tertiary'amine with orwithout the addition of further auxiliary products.

The present process is above all suitable for the manufacture of highly concentrated solutions of azo dyestuffs as contain an aminoazo dyestuff bonded via abridge member to the same or another azo or anthraquinone dyestuff containing at least one primary or secondary amino group.

As polyfunctional acylating agent is mentioned: phosgene as well as aliphatic dicarboxylic acid dihalides, such as oxalic acid dichloride, succinic acid dichloride and heterocyclic compounds containing at least two reactive halogen atoms, such as halogendiazines and halogentriazines, especially cyanuric chloride as well as dibromotriazines or dichlorotriazines.

As tertiary amines which can be used according to the invention there may, for example, be mentioned those of the formula wherein R,, R and R independently of each other denote methyl, ethyl, methoxyethyl or especially hydroxyethyl, and wherein R and R together with the nitrogen atom can also form a pyrrolidine, piperidine, morpholine or thiomorpholine ring. There are mentioned for example trialkylamines, such as trimethylamine or triethylamine, triethanolamine, monoethanoldimethylamine, trimethoxyethylamine or N-alkylated pyrrolidine, piperidine, N-methylpiperidine, morpholine, N-methylmorpholine, thiomorpholine, 1,4-

2 diazabicyclo-(2,2,2)-octane tetramine.

As further auxiliary agents, which can optionally be present are mentioned: the amides of inorganic or organic acids, preferably carboxylic acid amides, e.g., those of monobasic or dibasic carboxylic acids. such as the amides of carboxylic acids containing up to 8 carbon atoms, e.g., 2 to 4 carbon atoms, such as acetamide, propionic acid amide, and butyric acid amide, as well as malonic acid diamide. Urea and urea derivatives are particularly suitable; examples besides urea itself are substituted or unsubstituted alkyl-urea compounds such as methyl and ethyl urea, N,N'-dimethyl urea, and dihydroxyalkyl ureas. Further guanidine and its derivatives such as methyl guanidine are suitable. Also formamides such as alkylformamide, e. g., methyland dimethyl-formamide can be used as well as sulphonic acid amides or diamides.

Further auxiliary agents are for example antifoaming agents.

The production of the concentrated solutions is for example perfonned, that at least 2, preferably, however, 2.5 to 8 mols of a tertiary amine is added to the amino group containing azo and/or anthraquinone dyestuffs in aqueous medium, optionally together with further auxiliary until the solution reacts neutral. Thereafter, the acylating agent is gradually added (in the case of phosgene, by passing in the gas), and the pH is at the same time constantly kept weakly acid, neutral or very weakly alkaline by simultaneous dropwise addition of further tertiary amine. The reaction can be carried out at room temperature or preferably at slightly elevated temperature, for example between 20 and C. Depending on the desired concentration of the preparation to be produced, the resulting solution can be further diluted or can be concentrated, for example by evaporation. j

Highly concentrated solutions are obtained, which contain tertiary ammonium salts of dyestuffs preferably in such a species that all sulphonic acid and/or carboxylic acid groups are transferred to the tertiary ammonium salt, the dyestuff nucleus thereof being preferably of the formula or hexame thylenewherein A denotes the radical of an azo dyestuff, especially a monoazo dyestuff, B denotes the radical of a dyestuff which preferably also belongs to the azo, especially monoazo series, or also to the anthraquinone series, and X denotes a heterocyclic radical bonded via ring carbon atoms to the NH bridges, especially a triazine or diazine radical, a -CO bridge or a bridge of the formula COY-CO-, wherein Y denotes the direct carbon to carbon linkage or an aliphatic radical preferably containing 1 to 4 carbon atoms.

The new process is particularly valuable for the manufacture of disazo dyestuffs of the fonnula wherein C and F represent radicals of diazo components of the sulphobenzene or sulphonaphthalene series and D and E represent radicals of coupling components of the benzene, pyrazolone or naphthalene series, and wherein C and F and/or D and E can also be identical, and X denotes a CO-, COCO, or CO(CH ),,CO bridge or abridge of the formula 4 N complete. -(3 C- I The reaction mixture is allowed to cool and some tri- 1 3 ethanolamine hydrochloride formed screened off.

\ C The total weight of solution is adjusted to 600 parts 5 with water. A stable solution containing 25% by weight of the following dye results:

N N -2/ NH-CO-NH- N N so QT U,W.#. H so 9 3 triethanolamine salt 3 wherein n denotes an integer having a value of 1 t0 4 Using sodium carbonate in place of triethanolamine and 0 denotes a halogen atom, an etherified hydroxyl 15 thus forming the sodium salt of the dye. When acylagroup or an optionally substituted amino group. Such tion is complete the total weight of solution must be indisazo dyestuffs are, inter alia, described in French Pat. creased to 1,875 parts with water to produce a stable No. 1,572,030. solution containing 8% by weight of dye.

The highly concentrated solutions obtained according to the process of tertiary ammonium salts of direct 2O EXAMPLE 2 d i 84.2 parts of 3-(4'-amino-2'-tolylazo)-l ,5- a. 10 to 50 parts, especially 25 to 40 parts, of tertiary haphthalendlsulphPnic acid free acifil and substfinammonium salts of a condensation product of identical y free ofmorgamc 50 p r oftr ethanolamme or dissimilar azo and/or anthraquinone sulphonic acid and 100 Parts of Water are charged to a macho" Vesseland/or carboxylic acid compounds, each of said com- 25 o o pounds containing at least one primary or secondary At to 70 p "Produced helow h E amino group with a polyfunctional acylating agent, face simultaneously adding triethanolamme maintainb. 10 to 100 parts f water, ing pH between 5 and 6 until the reaction is complete. c. 5 to parts of tertiary amine, and 0 to 20 parts of an auxiliary product. The reaction mixture 18 allowed to cool and some tri- The highly concentrated solutions prove stable even ethanolamme hydrochlond? r d Screened On prolonged standing and the dyestuff neither crystal The total weightof solutionis ad usted to O parts lises out decomposes. They are miscible in any with water. Asolution containing 21% by weight ofthe ratio with water or, in part, also with suitable organic followmg dye results:

8036 is} CH 3G) 2 I T' N -Nn-c0-NH- N N L\ M I G) 3 trlethanolamlne salt 0 J solvents, and can be easily dosed by metering. They are Using sodium carbonate in place of triethanolamine, above all suitable for the manufacture of dyeing soluthus forming the sodium salt of the dye. When reaction tions for dyeing paper, especially in the mass, and for is complete the total weight of solution must be indyeing textile fibres, but can also be used for other purcreased to 900 parts with water to form a stable soluposes. Depending on the solubility of the dyestuff obtion containing 9% by weight of above dye.

tained according to the invention, the latter can, how- EXAMPLE 3 ever, also be partially of wholly present as a stable dis- 61.4 parts of metanilic-azo-o-anisidine (as free acid persion. and substantially free of inorganic salt), is condensed In the non-limitative examples which follow, the according to the process as for Example 2. A stable soparts, unless otherwise stated, denote parts by weight, lution containing 16% by weight of the following dye the percentages denote percentages by weight and the results:

SO OCH 3 triethanolamine salt temperatures are given in degrees Centigrade. Using sodium carbonate in place of triethanolaminc, EXAMPLE 1 thus forming the sodium salt of the dye. At the end of the reaction the total weight must be increased to 1,600 parts with water to form a stable solution containing 4% by weight of above dye.

84.2 parts of 3-(4'-amino-2 '-tolylazo)-l ,5- naphthalene disulphonic acid (as free acid and substantially free of inorganic salt), 74.2 parts of metanilic azoo-anisidine (as free acid and substantially free of inor- EXAMPLE 4 ganic salt), 100 parts of triethanolamine and 200 parts 68.6 parts of l-hydroxy-7-phenylazo-6-sulphonic of water are charged to 9eaction vessel. acid-3-aminonaphthalene (as free acid and substan- At 60 to phosgene is introduced below th urtially free of inorganic salt), is condensed according to face, simultaneously adding triethanolamine maintain the P ocess a for Exampl he final eight of soluing a pH-range between 5 and 6 until the reaction is tion being made P {0 500 Paris with Water to form a 6 stable solution containing 14% by weight of the follow If in the above Example the 200 parts of water are rei g d placed by a mixture of 100 parts of water and 80 parts I no on @w N- .;N N H 9 I NH-CO-NH I 9 035 59 triethanolamine salt Using sodium carbonate in place of triethanolamine, of urea phosgenation resulted in a solution containing thus forming the sodium salt of the dye. When the reac- 10 18% of the above dye. tion is complete the total weight of solution must be in- Using sodium carbonate in place of triethanolamine, creased to 7,000 parts with water to form a stable soluthus forming the sodium salt of the dye. The total tion containing 1% by weight of above dye. weight of solution at the end of the reaction must be increased to 38,280 parts with water to form a stable so- EXAMPLE 5 lution containing 0.15% by weight of above dye. 94.6 parts of 2-( 1 -naphthylazo)-l-hydroxy-6-aminonaphthalene-3,5-disulphonic acid (as free acid and EXAMPLE 7 substantially free of inorganic salt), are condensed ac- Process as for Example 2 but using N- cording to the process as for Example 2, the fi a methylpiperidine in place of triethanolamine. The final Weight of Solution being adjusted to 450 Parts with 20 weight of solution must be adjusted to 600 parts with water to form a stable solution containing 21% by water to form a stable solution containing 14% by weight of the following dye weight of the N-methylpiperidine salt of the dye.

3 triethanolamine salt Using sodium carbonate in place of triethanolamine, EXAMPLE 8 thus forming the sodium salt of the dye. When the reaction is complete the total weight of solution must be increased, to 1,200 parts with water to form a stable solution containing 8% by weight of above dye.

Process as for Example 2, but using trimethylamine as a 30% solution in water in place of triethanolamine. The final weight of solution must be adjusted to 600 parts with water to form a stable solution containing EXAMPLE 6 14% by weight of the trimethylamine salt of the dye.

30.7 parts of metanilic azo-o-anisidine (as free acid EXAMPLE 9 and substantially free of inorganic salt), 25.7 parts of Process as for Example 1, but using succinyl chloride 4-aminobenzeneazosalicylic acid (as partial hydrochloin place of phosgene. 200 parts of succinyl chloride are ride and substantially free of other inorganic ions), 200 40 added below the surface over 3 hours. The final weight parts of water and parts of triethanolamine are of product is adjusted to 800 parts with water. A stable 1 charged to a reaction vessel. At to phosgene is solution containing 20% by weight of the following dye introduced below the surface, simultaneously adding results:

3 3 N N-4/ -NH-CO-CH -CH CO-NH N N I Q triethanolarnine salt H3C S03 triethanolamine, maintaining pH between 5 and 6, until EXAMPLE 10 the reaction is complete. 10 parts of urea and 10 parts Process as for Example 1, but using oxalylchloride in ofa surface active agent are added. The mixture isalplace of phosgene. 300 parts of oxalylchloride are lowed to cool and sometriethanolamine hydrochloride added over 3 hours below the surface. The final weight formed screened off. The total weight of solution is ad- 55 of product is adjusted to l parts with water. A staju ted to 500 parts with water. A table solution conble solution containing 14% by weight of the following taining 12% by weight of the following dye results: ye results:

"' OCH tr i e thano lam ine s al t 0 triethanolarnine salt EXAMPLE 11 Process as for Example 5, but using N- methylmorpholine in place of triethanolamine. The total weight of product at the end of the reaction is adjusted to 600 parts with water. A stable solution containing 16% by weight of the N-methylmorpholine salt of the dye results.

EXAMPLE 12 90.2 parts of l-amino-2-methoxy-4-(2-naphthylazo- 4,8'-disulphonic acid)-5-methylbenzene (as free acid and substantially free of inorganic salt), 150 parts of water, 50 parts of triethanolamine are charged to a reaction vessel. At 60 to 70 phosgene is introduced below the surface, simultaneously adding triethanolamine, maintaining the pH between and 6 until the reaction is complete. 10 parts of urea and 10 parts of a. surface active agent may be added. The mixtures is allowed to cool, and some triethanolamine hydrochloride formed screened off. The total weight of solution is adjusted to 400 parts with water. A stable solution containing 23.2% by weight of the following dye results:

50 ll CO N N *NH-CO-Nlb N O 11 C 3 S0 triethanolamine salt Using sodium carbonate in place of triethanolamine, thus forming the sodium salt of the dye. The total weight of solution must be increased to 1,200 parts with water to produce a stable solution containing 7.7% by weight of above dye.

EXAMPLE 14 36.6 parts of cyanuric chloride. 75 parts of acetone. 35 parts of water. 125 parts of ice are charged together with 97.8 parts of l-(4-aminophenylamino)-4-aminoanthraquinone-3,3-disulphonic acid (as free acid and substantially free of inorganic salt) in a reaction vessel, and the temperature is kept at about 15. Triethanolamine is slowly added until pH becomes steady at 6 2o 7. The temperature is raised to and 51.4 parts of 4- aminobenzeneazosalicylic acid (as partial hydrochloride and substantially free of other inorganic ions) is charged. Finally triethanolamine is slowly added until pH becomes steady at 6 to 7.

At 100 42.0 parts of diethanolamine are charged and simultaneously triethanolamine is added maintaining pH between 6 and 7. Subsequently acetone is distilled off. When the reaction is complete, the pH of the solution is raised to 8.5 by addition of triethanolamine. 30 parts of urea and 20 parts of a surface active agend are charged. The liquid is cooled and some triethanolamine hydrochloride formed screened off. The total weight of solution is adjusted to 800 parts with water. A stabie solution containing 22% by weight of the following dye results:

N(C11 CH OH) 3 G) SO triethanolamine salt to column Ill following otherwise the procedure of Example I, there are obtained dye solutions containing the dye salts in an amount as stated in column V of said Table. The shades of the dye solutions obtained are shown in column VI.

TABLE l ll lll w V W Ex. Dye in No. Intermediates Acid acceptor Acylating agent solution Shade l7 R, R Na CO Cl-CO-Cl 4 yellow triethanolamine Cl-CO-Cl l6 yellow hexamethylenetetraml'ne Cl-CO-Cl 12 yellow 1 8 R R5 l la,CO Cl-CO-Cl 1 orange triethanolamine Cl-CO-Cl 14 orange 19 R R Na Co Cl-CO-Cl 8 red triethanolamine Cl-CO-Cl 21 red N-methylmorpholine Cl-CO-Cl 16 red R R, Na Co Cl-CO-Cl 0.2 yellow triethanolamine Cl-CO-Cl 12 yellow 2l R R, Na CO Cl-CO-Cl 8 yellow triethanolamine Cl-CO-Cl 30 yellow 22 R4 R triethanolamine C N Cl 22 green EXAMPLE 23 61 parts of the compound of the formula C OOH K OCH 25 N= R H N -\T ---N N. OH 2 H N N N and 84 parts of the compound of the formula 2 a OCH SO H so u 3 R are stirred with 200 parts of water. Triethanolamine is 3 N N added until a pH value of 7.0 is reached The volume of the mixture is adjusted to 600 parts with water and 3 40 phosgene is passed in at to for 12 hours. The pH so H 3 value is kept at between 6.0 to 7.0 by regular addition 3 of triethanolamine. The resulting concentrated solution of the yellow dyestuff of the formula 3 3 so? I N=N -Nnc0Nll -N=N l s03 triethanolamine salt 80? w isstable and can, if necessary, be concentrated further 4 by evaporation.

EXAMPLE 24 55 Measure sufficient volume of pulp to make a 10 g 2 sheet, for example a 3% pulp containing a 50:50 mix- H ture of bleached sulphite softwood and bleached hard- 3 wood sulphate containing l'/z% rosin. Add k to 3% dye 0H 60 on the solid sheet weight either as straight 60% liquid or diluted liquid whilst stirring at high speed. Continue R N N stirring for 3 minutes. Stand the coloured pulp 5 min- I utes, add 3% alum whilst stirring at high speed. Con- H0 8 NR tinue stirring for 3 minutes, stand for 5 minutes, dilute I 65 to suitable volume. Make paper sheept on the DECKLE, press between dry filter paper sheets twice, R N N dry under slight pressure (i.e., on KODAK glazer). The 6 v l rosin and alum may be omitted as the product has an no i S HO 8 NH excellentpaper affinlty.

3 3 2 vWe clalm:

l. A process for the production of a stable concentrated solution of water soluble tertiary ammonium salts of direct dyes, substantially free of inorganic salts which comprises adding at least 2 mols of a tertiary amine of the formula wherein R R and R independently of each other denote methyl, ethyl, methoxyethyl or hydroxyethyl or wherein R and R together with the nitrogen atom to which they are attached form a pyrrolidine, piperidine, morpholine or thiomorpholine ring to an aqueous medium containing A. one mole of a member of the group consisting of (l) a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (B) one mole ofa member of the group consisting of l a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, to form the tertiary ammonium salts of the said compounds, subsequently adding one mole of phosgene to the said aqueous medium to form the condensation product of the salts of said compounds with phosgene, the condensation reaction being conducted in the presence or absence of further auxiliary products.

2. A process according to claim 1 wherein each ofthe compounds (A) and (B) contains at least one primary amino group.

3. A process according to claim 1, wherein the tertiary amine used is of the formula wherein R,, R and R independently of each other denote methyl, ethyl, methoxyethyl or hydroxyethyl.

4. A process according to claim 1 wherein the tertiary amine is triethanolamine.

5. A process according to claim 1, wherein the condensation is carried out in the presence of further auxiliary products from the group of amides of inorganic or organic acids, antifoaming agents and mixtures thereof.

6. A process according to claim wherein urea is present as auxiliary agent.

7. A process according to claim 1 wherein the condensation reaction is carried out at a temperature between and 70C.

8. A process according to claim 1 wherein 2.5 to 8 mols of a tertiary amine are used.

9. A process according to claim 2, wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and compound (B) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound which is different from the compound (A).

10. A process according to claim 2, wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt ofa colored anthraquinone sulphonic acid or carboxylic acid compound.

11. A process according to claim 2, wherein two mols of a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound are employed compound (A) and (B).

12. A stable concentrated solution of water-soluble tertiary ammonium salt of direct dye containing a. 10 to 50 parts of the condensation product of (A) one mole of a member of the group consisting of (l) a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (B) one mole ofa member of the group consisting of( l a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group with (C) one mole of phosgene, the tertiary ammonium salt being one derived from a tertiary amine of the formula l N R 3 wherein R R and R independently of each other denote methyl, ethyl, methoxyethyl or hydroxyethyl or wherein R and R together with the nitrogen to which they are attached form a pyrrolidine, piperidine, morpholine or thiomorpholine ring, b. 10 to parts of water, c. 5 to 25 parts of tertiary amine of the above indicated formula, and

d. 0 to 20 parts of an auxiliary product.

13. A stable concentrated solution according to claim 12 wherein each of the compounds (A) and (B) contains at least one primary amino group.

14. A stable concentrated solution according to claim 12 wherein the tertiary amine is of the formula wherein R R and R independently of each other denote methyl, ethyl, methoxyethyl or hydroxyethyl.

15. A stable concentrated solution according to claim 12 wherein the tertiary amine is triethanolamine.

16. A stable concentrated solution according to claim 12 wherein the component ((1) is a member of the group of amides of inorganic or organic acids, antifoaming agents and mixtures thereof.

17. A stable concentrated solution according to claim 16 wherein the component ((1) is urea.

18. A stable concentrated solution according to claim 13 wherein the compound (A) is a tertiary ammonium salt ofa monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound different from compound (A).

19. A stable concentrated solution according to pound are employed as compounds (A) and (B).

2 1. A stable concentrated solution according to claim 12 containing at to parts of a dyestuff selected from those of claim 13 wherein the compound (A) is a tertiary am- 5 the formula 502 Q cu I fs u N-2 }Nu-co-Nu N N i cu 0 ,50 S0 [triethanolamine salt] 3(3) on 011 3;, l -N N nu-oo-nn ---'N I 7-. v" \I Q 4 3 Itricti'iariolaininc salt] 3 u N-- NH-CmmiQ-N N o o S0 OCH CH 3 {tricthariolamine salt] H I? I N=N" l2 O Nl-lCONIl '9 3 3 3 \J 3 I [triethanolamine salt] and OCH monium salt of a monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt ofa colored anthraquinone sulphonic acid or carboxylic acid compound.

20. A stable concentrated solution according to claim 13 wherein 2 mols of a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid com- [triethanolarnine salt] 

1. A PROCESS FOR THE PRODUCTION OF A STABLE CONCENTRATED SOLUTION OF WATER SOLUBLE TERTIIARY AMMONIUM SALTS OF DIRECT DYES, SUBSTANTIALLY FREE OF INORGANIC SALTS WHICH COMPRISES ADDING AT LEAST 2 MOLS OF A TERTIARY AMINE OF THE FORMULA
 2. A process according to claim 1 wherein each of the compounds (A) and (B) contains at least one primary amino group.
 3. A process according to claim 1, wherein the tertiary amine used is of the formula
 4. A process according to claim 1 wherein the tertiary amine is triethanolamine.
 5. A process according to claim 1, wherein the condensation is carried out in the presence of further auxiliary products from the group of amides of inorganic or organic acids, antifoaming agents and mixtures thereof.
 6. A process according to claim 5 wherein urea is present as auxiliary agent.
 7. A process according to claim 1 wherein the condensation reaction is carried out at a temperature between 20* and 70*C.
 8. A process according to claim 1 wherein 2.5 to 8 mols of a tertiary amine are used.
 9. A process according to claim 2, wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and compound (B) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound which is different from the compound (A).
 10. A process according to claim 2, wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound.
 11. A process according to claim 2, wherein two mols of a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound are employed as compound (A) and (B).
 12. A stable concentrated solution of water-soluble tertiary ammonium salt of direct dye containing a. 10 to 50 parts of the condensation product of (A) one mole of a member of the group consisting of (1) a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (B) one mole of a member of the group consisting of (1) a tertiary ammonium salt of an azo sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group, and (2) a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound containing at least one primary or secondary amino group with (C) one mole of phosgene, the tertiary ammonium salt being one derived from a tertiary amine of the formula
 13. A stable concentrated solution according to claim 12 wherein each of the compounds (A) and (B) contains at least one primary amino group.
 14. A stable concentrated solution according to claim 12 wherein the tertiary amine is of the formula
 15. A stable concentrated solution according to claim 12 wherein the tertiary amine is triethanolamine.
 16. A stable concentrated solution according to claim 12 wherein the component (d) is a member of the group of amides of inorganic or organic acids, antifoaming agents and mixtures thereof.
 17. A stable concentrated solution according to claim 16 wherein the component (d) is urea.
 18. A stable concentrated solution according to claim 13 wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound different from compound (A).
 19. A stable concentrated solution according to claim 13 wherein the compound (A) is a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound and the compound (B) is a tertiary ammonium salt of a colored anthraquinone sulphonic acid or carboxylic acid compound.
 20. A stable concentrated solution according to claim 13 wherein 2 mols of a tertiary ammonium salt of a monoazo sulphonic acid or carboxylic acid compound are employed as compounds (A) and (B).
 21. A stable concentrated solution according to claim 12 containing a. 25 to 40 parts of a dyestuff selected from those of the formula 